Syntax: memcached_next_upstream error | timeout | invalid_response | not_found

Syntax: client_header_timeout time; Default: client_header_timeout

Syntax: proxy_read_timeout time; Default: proxy_read_timeout 60s;

Syntax: protocol imap | pop3 | smtp; Default:

Syntax: underscores_in_headers on | off; Default: underscores_in_headers

Syntax: ssl_session_tickets on | off; Default: ssl_session_tickets

Syntax: client_header_buffer_size size; Default: client_header_buffer_size

Syntax: lingering_timeout time; Default: lingering_timeout 5s;

Syntax: fastcgi_send_lowat size; Default: fastcgi_send_lowat 0;

Syntax: proxy_cache_path path [levels=levels] [use_temp_path